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Home My WebLink About2001 Tabasco Oil PoolPHI PHILLIPS Alaska, Inc. A Subsidiary of PHILLIPS PETROLEUM COMPANY P.O. BOX 100360 ANCHORAGE, ALASKA 99510-0360 March 28, 2002 Ms. Camille Oechsli Taylor, Commissioner Alaska Oil and Gas Conservation Commission 333 West 7t" Ave. Suite #100 Anchorage, Alaska 99501-3539 Stephen V. Bross Supervisor Greater Kuparuk Area Satellites ATO - 1170 Phone 265-6083 Fax 265-6133 Re: 2001 Tabasco Oil Pool Annual Reservoir Surveillance Report Dear Ms. Oechsli Taylor: In compliance with Rule 11, Conservation Order No. 435, Phillips Alaska, Inc., operator of the Kuparuk River Field, is hereby submitting the annual report on the Tabasco Oil Pool. This report documents the required information pertinent to the field development and enhanced recovery operations from January through December 2001. The following is an outline of the information provided: a. A summary of the enhanced recovery project (Attachment 1). 2. Voidage balance, by month, for produced and injected fluids (Attachment 2, Attachment 3). c. Analysis of reservoir pressure surveys taken in 2001 (Attachment 4). d. Results of production surveys, and any special surveys, taken on the Tabasco Oil Pool in 2001 (Attachment 5). e. Results of well allocation and test evaluation for Rule 7, and any other special monitoring (Attachment 6). f. Future development plans (Attachment 7). If you have any questions concerning this data, please contact Bob Christensen at (907) 659-7535 or Jim Ennis at (907) 265-1544. Sincerely, Stephen V. Bross GKA Satellites Supervisor RECEIVED MAR 2 8 2002 bcc: Central Files John Braden John Hand Dan Kruse Jim Ennis Bob Christensen Michael Balog & Grant Doman Mark Stevenson ATO — 320 ATO — 1276 ATO — 1228 ATO — 1220 ATO — 1208 NSK — 69 NSK — 69 ATO — 1232 Attachment 1 Kuparuk River Unit Tabasco Oil Pool 2001 Annual Reservoir Surveillance Report Summary of the Enhanced Recovery Project Tabasco produced 1317 MSTB of crude, 180 MMSCF of formation gas, and 4357 MBW of water during 2001. Water injection was 5040 MBWI over the same period. Cumulative oil, gas, and water production and water injection through year end 2001 were 5630 MSTBO, 802 MMSCF, 10160 MBW, and 13362 MBWI, respectively. The cumulative injection/withdrawal ratio was 0.83 on a reservoir barrel basis through year end 2001. Reservoir pressure declined from approximately 1100 psi to 1050 psi during 2001. No new wells were drilled nor were any rig workovers performed on Tabasco wells in 2001. Producers 2T-204 and 2T-217A were remedially acidized due to apparent screen plugging. Injector 2T-210 remained shut-in with mechanical problems which continue to prevent water injection. Producer 2T-209 ESP equipment experienced a downhole electrical failure on October 30, 2001 and was shut-in the remainder of the year awaiting a rig. Year end 2001 Tabasco well count (all at Kuparuk River Unit Drill Site 2T) was: Producers: 7 completed 6 on line Injectors: 2 completed 1 on line Water production increased to a year end water:oil ratio of 4.9 bbl water per STBO. Water breakthrough occurred at all 7 producers. Production and injection logs, coupled with the structural positions and water breakthrough histories of the producers, suggest that the water production mechanism is dominated by gravity -induced slumping. Attachment 2 Tabasco Oil Pool 2001 Annual Reservoir Surveillance Report Produced Fluid Volumes OIL GAS WATER CUM OIL CUM GAS CUM WATER MO YR STB MSCF BBL STB MSCF BBL 1 2001 142138 16984 405097 4455464 638986 6208711 2 2001 127866 17081 348378 4583330 656067 6557089 3 2001 126115 15368 407122 4709445 671435 6964211 4 2001 114754 14850 402711 4824199 686285 7366922 5 2001 116318 15595 434304 4940517 701880 7801226 6 2001 118818 18605 431661 5059335 720485 8232887 7 2001 120503 18731 433436 5179838 739216 8666323 8 2001 118782 17087 397195 5298620 756303 9063518 9 2001 115470 16535 361070 5414090 772838 9424588 10 2001 96542 12481 312408 5510632 785319 9736996 11 2001 66583 8314 160724 5577215 793633 9897720 12 2001 53673 9000 262903 5630888 802633 10160623 2001 TOTAL 1317562 180631 4357009 Last years Cum 4313326 622002 5803614 Attachment 3 Tabasco Oil Pool 2001 Annual Reservoir Surveillance Report Injected Fluid Volumes WATER GAS NGLS CUM WATER CUM GAS CUM NGLS MO YR STB MSCF MSCF STB MSCF MSCF 1 2001 285363 0 0 8607896 0 0 2 2001 415120 0 0 9023016 0 0 3 2001 452441 0 0 9475457 0 0 4 2001 434766 0 0 9910223 0 0 5 2001 399758 0 0 10309981 0 0 6 2001 473242 0 0 10783223 0 0 7 2001 443938 0 0 11227161 0 0 8 2001 462240 0 0 11689401 0 0 9 2001 434965 0 0 12124366 0 0 10 2001 376982 0 0 12501348 0 0 11 2001 453737 0 0 12955085 0 0 12 2001 407515 0 0 13362600 0 0 2001 TOTAL 5040067 0 0 Last years Cum 8322533 0 0 Attachment 4 Kuparuk River Unit Tabasco Oil Pool 2001 Annual Reservoir Surveillance Report Reservoir Pressure Surveys Rule 8 Form 10-412 follows Z O c U) D N o O U OO . Z W O cc I— W cc Ir N W (n Z 2 O a _¢ Q O Q Z U) Q QJ oa Q D le Z Q Z J Q Q crCl) ma N a) � a N m ro (D LL C7 U m O O C O U o o C T � E ro >T 2 o U O a a) O OT ro C7 ro ro 0 m N I-- V 41 m a U (j r C7 O C, O O C) a C � ro O C O N O N C(O 7 O Ty O r C2 ;N N N 1A r Q O O m a O v .� 0 O - ro O N m V h c0 m N a E a CT CD 3CO O la d m O O m I- m m O V M C) CO V a) a N x O ro >> CO C m y O O a IL r co 0 m m N r ro v m 2 E m m m ID ap LL O m H Q N d > =r F) m m m m co 2 o n O rNi m m m"t V a a m Y H CD m Il- O N l!7 N V aD m C) N +- C_ IM , C_ y CO L L O m LL CO F-- d � O O W V' O N O m cn co cfl r cn 0) O a a - E_cc ° to 3 a co ~ y a T E E o - U 0 0 0 0 0 0 o> � 000C � w+ m ro� o 0 0 r a) Y C7 0 _ O>j 0000 00 U r 0 O U C ro O O O O O 3 r c O V - N P� W CO CO T a E Q 3 o o 0 0 0 o N N N N N N m C a`) Z co C0 cm m m cm o - 0 > o 0 0 0 0 o CC 0 0 0 0 0 0 Y M In 0 LO N In `p a C ro a) L CL in��H�r o EY 7�e 6 c Z T m Y 00 ca m (6 - Q) E Q O u! J ro N -f I- m m n a a 4- O Z - 0 0 0 0 N N N N N N C 'a L C O F F H H H H L Z IL 7 N N N N N N- (o co U Q I] c C a U E 1 Q Attachment 5 Kuparuk River Unit Tabasco Oil Pool 2001 Annual Reservoir Surveillance Report Production Logs and Special Surveys Well Date Comments None N/A -Type None No logs or production surveys were run during the calendar year 2001. Attachment 6 Kuparuk River Unit Tabasco Oil Pool 2001 Annual Reservoir Surveillance Report Wells Allocation and Test Evaluation Summary A minimum of two well tests per month were taken on production wells. Fluid samples were obtained on a regular basis, and water cut corrections were applied to well tests as required based on the subsequent lab analysis. Generally, very good agreement was observed between the phase dynamics and the shakeout analysis. Production volumes were tracked through the Setcim production monitoring system. Tabasco production was applied an allocation factor of 1.0 for 2001. Attachment 7 Kuparuk River Unit Tabasco Oil Pool 2001 Annual Reservoir Surveillance Report Future Development Plans Tabasco Drill Site 2T development plans for 2002 and beyond were created to take advantage of the gravity -induced water slumping. Horizontal producers are planned near the top of the interval to provide vertical standoff from the water. The design phase for a horizontal producer was begun in 1999. Studies of horizontal hole stability, drill -in and completion fluids, and completion equipment are in progress. It is expected that the first horizontal producer will be drilled in early 2002. Current plans include drilling a total of three horizontal producers. Injection plans call for increasing injection to accomplish a cumulative net zero voidage and restore original reservoir pressure. Another workover to mitigate mechanical problems at injector 2T-210, which prevent water injection, is being considered. Two new vertical injectors or a structurally low horizontal injector are planned to support the additional offtake from planned future producers. However, conversion(s) of an existing producer(s) to water injection is also being considered as an alternative to new injectors. The feasibility of polymer flooding was studied in 2001 and laboratory tests were completed. A full -field reservoir model is currently being history matched but preliminary results for polymer flooding do not indicate economic feasibiltiy. Screening evaluations indicate that Tabasco development beyond Drill Site 2T is most prospective at Kuparuk River Unit Drill Sites 3H and 3G. Tabasco geologic and engineering studies in 1999 identified Drill Site 3H appraisal well locations which may be drilled as early as fourth quarter 2003.